If this is your first visit, be sure to
check out the FAQ by clicking the
link above. You may have to register
before you can post: click the register link above to proceed. To start viewing messages,
select the forum that you want to visit from the selection below.

TI 5000 high pass problems

I've quite recently made a second hand purchase for a pair of TI 5000 speakers, knowing in advance that some repair of the speakers was needed.

The previous owner has been tampering with the high pass cross over section, and both 050TI tweeters has been damaged in the process. I would very much like to bring the cross over back to the original condition, and verify if only one, or both 050TI's is blown to pieces.

Could anyone help me with a schematic for the cross over board in the TI 5000, or just the section for the 050TI tweeter. Mid and Low section seems to be the original parts.

I also need information about DCR for the 050TI tweeter. One tweeter measure 2.4 Ohm and the other is completely open.

Hi.
I also bought a pair of TI5000 recently. They are in perfect shape, but of course I had to look inside .
The crossover seems not to be the one pictured in the technical manual linked above. Unfortunately no manual can be downloaded from the Harman website.

My crossover has the designation "TI5000G" on it and the part number is 270511. The boxes serial number is also ending with a "G". They were purchased in Germany and are made in Denmark.

There are a lot of rumors about different versions of the TI5000 on the net, but I didn't find any facts. Anyway the crossover doesn't look cheaper than the one in the posted ts. It even has more parts and polypropylene caps for the tweeter.
Does anybody have a technical manual for this version or know more about it?

Hi Tim,
yes of course I could draw it myself, but I'll have to unsolder some very thick cables. If possible I want to avoid doing it with my "new" speakers.
If no one has a schematic, I will do it eventually and of course post the result here. Sooner or later my curiosity will be big enough .

Hi folks,
as expected my curiosity grew big enough to draw a schematic of the NTI5000G network . Unfortunately the inductors were not labeled, so I had to measure them. However, here is the result with 6 Ohms as the nominal load resistances.

The path for the upper mid looks quite unusual. The schematic is drawn in SwitcherCad, so I could plot the voltage drives.

The lower mid driver is turned down significantly, so the speaker works nearly as a three-way with some lower mid support. Strange design, I haven't anything like this before. Does anybody have a good explanation for this?
To check, if I made an error drawing the schematic, I measured the crossover connected to a power amp and a 6 Ohms resistor. The result is very close to the simulation.

Perhaps the information is useful for the System Information section?
Any comments about the unusual design are welcome.

For comparison, here's the schematic and voltage drive for the original (not G) version of the Ti5000 network NTI5000.

I think there must be something wrong with the phases in the original manual.
After some phase inversion the voltage drive makes more sense.

Now it looks like what I expected it to look for this speaker. Perhaps they just connected the drivers with the wrong phases in the original version and this led to the developement of the "G" version? Just an idea...

Hi folks.
I found something in some old german hifi magazines about the design of the Ti5000. Since it was the biggest JBL speaker it could be found on the cover of every bigger hifi mag in the mid-ninties.
The developer seems to be Berndt Stark, who is now at Quadral. According to his statements, the 705G (midrange speaker) had a too low efficiency in the lower working range, so it had to be reinforced by a second one. This becomes clear when you look at the frequency response of the 705G (from "Audio" magazine):
Doesn't anybody know from where the non-G version of the crossover design originates? Looking at the voltage drive, it may have weak lower midrange.
Wasn't the Ti5000 sold in the US at all?